[lawry]

You might want to take a look at the singleFile chrome/firefox extension. It essentially combines all images, scripts, css into one html file that can be opened offline. As a bonus you can edit the html page with the inspector to hide irrelevant parts and it will save it in that state.

[LordDragonfang]

How is that different than mhtml, which is already the default file type for ctrl-s on Chrome?

[Asooka]

MHtml doesn't execute javascript, see https://bugs.chromium.org/p/chromium/issues/detail?id=452901 https://bugs.chromium.org/p/chromium/issues/detail?id=330663